掌握Oracle 10监听信息,精准查询
Oracle是一种强大的关系型数据库管理系统,广泛应用于企业级应用中。其中的监听程序负责管理数据库实例的连接请求,并且提供特定端口的服务,使得客户端程序能够定位到数据库实例。因此,掌握Oracle 10监听信息可以帮助管理员有效地诊断和解决数据库连接问题。本文将介绍如何在Oracle 10中查看和分析监听信息,并进行精准查询。
我们需要登录到Oracle数据库,并查看数据库监听器状态。可以使用以下命令来查看:
“`sql
lsnrctl status
该命令将显示当前Oracle数据库的监听器状态,包括监听器名称、监听器版本、监听器状态、监听器进程ID以及监听器使用的端口等信息。例如:
LSNRCTL for Linux: Version 10.2.0.5.0 – Production on 05-AUG-2021 15:33:01
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=myhost)(PORT=1521)))
STATUS of the LISTENER
————————
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.5.0 – Production
Start Date 05-AUG-2021 11:59:55
Uptime 0 days 3 hr. 33 min. 6 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=myhost)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary…
Service “orcl” has 1 instance(s).
Instance “orcl”, status READY, has 1 handler(s) for this service…
Service “orclXDB” has 1 instance(s).
Instance “orcl”, status READY, has 1 handler(s) for this service…
通过上述状态信息,我们可以了解到监听器的名称为LISTENER,所监听的端口为1521,提供了两个数据库服务分别为orcl和orclXDB。
当然,我们也可以通过查看监听器的日志文件来进一步分析连接请求和监听事件。可以使用以下命令来查看监听器的日志文件:
```sql
lsnrctl status
该命令将在控制台中显示监听器的日志文件路径。例如:
LSNRCTL for Linux: Version 10.2.0.5.0 - Production on 05-AUG-2021 15:35:33
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=myhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.5.0 - Production
Start Date 05-AUG-2021 11:59:55
Uptime 0 days 3 hr. 35 min. 37 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=myhost)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@myhost ~]$ tl -f /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
在监听日志文件中,我们可以查看每个连接请求的详细信息,包括客户端主机名、监听器日志级别、连接的数据库名称和版本号以及连接状态等。例如:
05-AUG-2021 15:28:46 * (CONNECT_DATA=(SERVICE_NAME=orcl)(CID=(PROGRAM=)(HOST=myhost)(USER=oracle))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=49203)) * establish * orcl * 0
05-AUG-2021 15:28:46 * (CONNECT_DATA=(SERVICE_NAME=orcl)(CID=(PROGRAM=)(HOST=myhost)(USER=oracle))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=49203)) * establish * orcl * 0
通过分析监听器日志文件,我们可以了解到哪些客户端正在连接数据库以及哪些数据库服务受到的连接请求最多。
我们可以针对特定的数据库服务进行查询。可以使用以下命令来查询特定服务的连接请求数和连接状态:
“`sql
SELECT count(*), status FROM v$session WHERE service_name = ” GROUP BY status;
该命令将返回特定数据库服务的连接请求数量以及不同连接状态的数量。例如:
```sql
SQL> SELECT count(*), status FROM v$session WHERE service_name = 'orcl' GROUP BY status;
COUNT(*) STATUS
---------- -------
17 ACTIVE
1 INACTIVE
通过以上方式,我们可以精准查询我们需要的数据库连接信息,并及时调整数据库连接状态,以确保企业级应用的稳定性。